Method for reducing polymerization degree in process of producing pulp through linters

A technology of cotton linters and degree of polymerization, which is applied in the post-treatment of cellulose pulp, non-woody plant/crop pulp, textiles and papermaking, etc. It can solve the problems of difficult black liquor treatment, high cost of water treatment, low yield, etc. question

Inactive Publication Date: 2014-06-25
李昊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention proposes a method for reducing the degree of polymerization in the process of producing pulp from cotton linters, which solves the problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The degree of polymerization of cotton linters after bio-enzyme treatment is 2000, and after two stages of hydrogen peroxide bleaching, 5wt% H 2 SO 4 , the degree of polymerization decreased to 500 after treatment at 50°C and 10wt% slurry concentration for 2 hours.

Embodiment 2

[0024] Cotton linters have a degree of polymerization of 2000 after biological enzyme treatment, and first pass through 5wt% H 2 SO 4 After 2 hours of treatment at 50°C and 10wt% slurry concentration, the second stage of H 2 o 2 The degree of polymerization after bleaching was reduced to 500. The whiteness of embodiment 2 has been improved by four degrees under the same bleaching conditions than embodiment 1, because iron ions in the pulp have been removed after the enzyme treatment first, and the H 2 o 2 bleaching efficiency.

Embodiment 3

[0026] The degree of polymerization of cotton linters after bio-enzyme treatment is 2000, add 10wt% H 2 SO 4 The degree of polymerization decreased to 500 after being treated at room temperature (20°C) for 4 hours at a slurry concentration of 10 wt%.

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PUM

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Abstract

The invention provides a method for reducing polymerization degree in process of producing pulp through linters. The method comprises the following steps: treating the linters, bleaching and washing after bleaching, wherein an acid treatment step is arranged before or after the bleaching process, an acid treatment agent used in the acid treatment step is at least one acid, the amount of the acid treatment agent is 0.5-10 weight percent, the treatment temperature is 20-180 DEG C, the treatment time is 0.5-10 hours, the concentration of paper pulp is 3-30 weight percent; the amount of the acid treatment agent is inversely proportional to the treatment temperature; the amount of the acid treatment agent is inversely proportional to the treatment time; the treatment temperature is inversely proportional to the treatment time. The invention relates to the technical field of pulp for adhesive fibers, and the problems that the energy consumption in the process of reducing the fiber polymerization degree is high, the productivity is low, the treatment difficulty of black liquor is high and the water treatment cost is high in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of pulp for adhesive fibers, in particular to a method for reducing the degree of polymerization in the process of producing pulp from cotton linters. Background technique [0002] At present, the production method of pulp for adhesive fibers is generally cotton linters→cooking→washing→bleaching→washing after bleaching. Among them, the main purpose of cooking is to degrease, and the second is to reduce the degree of polymerization of fibers to the required level. The cooking medicine is generally caustic soda. The purpose of washing is to remove the extractables after cooking. The purpose of bleaching is to improve the whiteness of pulp to the required level. The purpose of washing after rinsing is to wash away the extractables during the bleaching process. [0003] In the production process, if the ash content in the raw material is too high, generally one-stage multi-stage or two-stage multi-stage heavy...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21C9/00
Inventor 李昊
Owner 李昊
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